Why are some of the faces on my mesh lit up?
First off, you should check where your light is coming from.

If the light is close to the door, the dents of the doorframe might block light, only parts that are raised a bit will catch the light. You could easily check that by placing another light source in the scene. 

Another thing you should check is if your normals are ok. You can tell blender to recalculate these when you go into Edit Mode, select the affected faces of the model (should be ok if you just select the entire model) and then press "Recalculate" in the left tab under "Shading/UVs". Flipped Normals can often cause lighting issues in the viewport as well.